Viana do Castelo weather in May
In May, Viana do Castelo sees average daytime highs of 19°C and overnight lows near 12°C, with 133 mm of rain across 11.8 wet days and about 14.3 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.
Highs climb over the month, from about 17°C in the first days to 20°C by the end. The sky is clear or mostly clear about 36% of the time in May, and the air most often feels dry.
Daylight stretches from about 13 h 48 min at the start of May to 14 h 48 min by month's end. Set against the rest of the year, May is Viana do Castelo's 5th-clearest and 7th-windiest month. For the whole year in context, see Viana do Castelo's year-round climate.
- Daytime high
- 19°
- 6th warmest
- Overnight low
- 12°
- 7th coldest
- Rainfall
- 133 mm
- 11.8 wet days
- Daylight
- 14 h 18 min
- 5:21 AM – 7:42 PM
- Cloud cover
- 52%
- 5th clearest
- Wind
- 13 km/h
- 7th windiest
- Solar energy
- 6.5 kWh/m²
- Travel score
- 5.9
- out of 10
Viana do Castelo is city seat of Viana do Castelo municipality in northern Portugal and seat of the municipality and district of the same name.
- Air quality
- Excellent
- PM10 9.1 µg/m³ · 2013
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Highs climb over the month, from about 17°C in the first days to 20°C by the end.
A typical May day in Viana do Castelo reaches about 19°C in the afternoon and slips back to 12°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, May runs about 2°C warmer than April and about 3°C cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Avg low (°C) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 17 | 11 |
| 2 | 17 | 11 |
| 3 | 17 | 11 |
| 4 | 18 | 11 |
| 5 | 18 | 11 |
| 6 | 18 | 11 |
| 7 | 18 | 11 |
| 8 | 18 | 11 |
| 9 | 18 | 11 |
| 10 | 18 | 11 |
| 11 | 18 | 11 |
| 12 | 18 | 11 |
| 13 | 18 | 12 |
| 14 | 18 | 12 |
| 15 | 19 | 12 |
| 16 | 19 | 12 |
| 17 | 19 | 12 |
| 18 | 19 | 12 |
| 19 | 19 | 12 |
| 20 | 19 | 12 |
| 21 | 19 | 12 |
| 22 | 19 | 12 |
| 23 | 19 | 12 |
| 24 | 19 | 13 |
| 25 | 20 | 13 |
| 26 | 20 | 13 |
| 27 | 20 | 13 |
| 28 | 20 | 13 |
| 29 | 20 | 13 |
| 30 | 20 | 13 |
| 31 | 20 | 13 |
Viana do Castelo weather by month
How May compares with the rest of the year at a glance. May is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 13° / 7° | 218 | 13.6 | 9.3 | 3.3 |
| Feb | 14° / 7° | 142 | 10.4 | 10.3 | 3.9 |
| Mar | 15° / 8° | 165 | 11.3 | 11.7 | 4.7 |
| Apr | 17° / 10° | 154 | 13 | 13.1 | 5.0 |
| May | 19° / 12° | 133 | 11.8 | 14.3 | 5.9 |
| Jun | 21° / 14° | 56 | 6.9 | 15 | 7.2 |
| Jul | 23° / 16° | 32 | 4.4 | 14.7 | 8.4 |
| Aug | 24° / 16° | 45 | 5 | 13.7 | 8.3 |
| Sep | 22° / 15° | 89 | 7.4 | 12.3 | 7.3 |
| Oct | 19° / 13° | 232 | 13.2 | 10.9 | 5.7 |
| Nov | 15° / 10° | 232 | 14.2 | 9.6 | 4.3 |
| Dec | 13° / 8° | 227 | 14.1 | 9 | 3.5 |
Cloud cover in May
The sky is clear or mostly clear about 36% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 53 | 53 | 54 | 55 | 56 | 56 | 57 | 58 | 58 | 59 | 59 | 59 | 59 | 59 | 59 | 60 |
| Cloudier (%) | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 46 | 45 | 44 | 44 | 43 | 42 | 42 | 41 | 41 | 41 | 41 | 41 | 41 | 40 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 50 | 50 |
| 2 | 50 | 50 |
| 3 | 51 | 49 |
| 4 | 51 | 49 |
| 5 | 51 | 49 |
| 6 | 51 | 49 |
| 7 | 51 | 49 |
| 8 | 51 | 49 |
| 9 | 51 | 49 |
| 10 | 51 | 49 |
| 11 | 51 | 49 |
| 12 | 52 | 48 |
| 13 | 52 | 48 |
| 14 | 52 | 48 |
| 15 | 52 | 48 |
| 16 | 53 | 47 |
| 17 | 53 | 47 |
| 18 | 54 | 46 |
| 19 | 55 | 45 |
| 20 | 56 | 44 |
| 21 | 56 | 44 |
| 22 | 57 | 43 |
| 23 | 58 | 42 |
| 24 | 58 | 42 |
| 25 | 59 | 41 |
| 26 | 59 | 41 |
| 27 | 59 | 41 |
| 28 | 59 | 41 |
| 29 | 59 | 41 |
| 30 | 59 | 41 |
| 31 | 60 | 40 |
Chance of precipitation in May
Viana do Castelo gets around 133 mm of rain over 11.8 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 38% and peaks near 42% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 42 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 38 | 38 | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 34 | 34 | 33 | 32 | 32 |
| Rain chance (%) | |
|---|---|
| 1 | 42 |
| 2 | 41 |
| 3 | 41 |
| 4 | 41 |
| 5 | 41 |
| 6 | 41 |
| 7 | 41 |
| 8 | 41 |
| 9 | 40 |
| 10 | 40 |
| 11 | 40 |
| 12 | 40 |
| 13 | 40 |
| 14 | 39 |
| 15 | 39 |
| 16 | 39 |
| 17 | 39 |
| 18 | 38 |
| 19 | 38 |
| 20 | 37 |
| 21 | 37 |
| 22 | 36 |
| 23 | 36 |
| 24 | 36 |
| 25 | 35 |
| 26 | 35 |
| 27 | 34 |
| 28 | 34 |
| 29 | 33 |
| 30 | 32 |
| 31 | 32 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 72% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 87 | 86 | 86 | 85 | 85 | 84 | 84 | 82 | 81 | 80 | 80 | 79 | 78 | 77 | 75 | 73 | 72 | 71 | 69 | 68 | 66 | 65 | 63 | 61 | 60 | 58 | 57 | 55 | 54 | 53 | 52 |
| Comfortable (%) | 13 | 14 | 14 | 15 | 15 | 16 | 16 | 17 | 18 | 19 | 19 | 20 | 21 | 22 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 39 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 9 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 87 | 13 | 0 |
| 2 | 86 | 14 | 0 |
| 3 | 86 | 14 | 0 |
| 4 | 85 | 15 | 0 |
| 5 | 85 | 15 | 0 |
| 6 | 84 | 16 | 0 |
| 7 | 84 | 16 | 0 |
| 8 | 82 | 17 | 1 |
| 9 | 81 | 18 | 1 |
| 10 | 80 | 19 | 1 |
| 11 | 80 | 19 | 1 |
| 12 | 79 | 20 | 1 |
| 13 | 78 | 21 | 1 |
| 14 | 77 | 22 | 1 |
| 15 | 75 | 24 | 1 |
| 16 | 73 | 25 | 2 |
| 17 | 72 | 26 | 2 |
| 18 | 71 | 27 | 2 |
| 19 | 69 | 28 | 3 |
| 20 | 68 | 29 | 3 |
| 21 | 66 | 30 | 4 |
| 22 | 65 | 31 | 4 |
| 23 | 63 | 32 | 5 |
| 24 | 61 | 33 | 6 |
| 25 | 60 | 34 | 6 |
| 26 | 58 | 35 | 7 |
| 27 | 57 | 36 | 7 |
| 28 | 55 | 37 | 8 |
| 29 | 54 | 38 | 8 |
| 30 | 53 | 39 | 8 |
| 31 | 52 | 39 | 9 |
Wind in May
Winds average 13 km/h in May.
Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 13 | light breeze |
| 2 | 13 | light breeze |
| 3 | 13 | light breeze |
| 4 | 13 | light breeze |
| 5 | 13 | light breeze |
| 6 | 13 | light breeze |
| 7 | 13 | light breeze |
| 8 | 13 | light breeze |
| 9 | 13 | light breeze |
| 10 | 13 | light breeze |
| 11 | 13 | light breeze |
| 12 | 13 | light breeze |
| 13 | 13 | light breeze |
| 14 | 13 | light breeze |
| 15 | 13 | light breeze |
| 16 | 13 | light breeze |
| 17 | 13 | light breeze |
| 18 | 13 | light breeze |
| 19 | 13 | light breeze |
| 20 | 12 | light breeze |
| 21 | 12 | light breeze |
| 22 | 12 | light breeze |
| 23 | 12 | light breeze |
| 24 | 12 | light breeze |
| 25 | 12 | light breeze |
| 26 | 12 | light breeze |
| 27 | 12 | light breeze |
| 28 | 12 | light breeze |
| 29 | 12 | light breeze |
| 30 | 12 | light breeze |
| 31 | 12 | light breeze |
Sunrise & sunset in May
Daylight runs from about 13 h 48 min at the start of May to 14 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 60 minutes over May. Sunrise moves from 5:39 AM to 5:10 AM, and sunset from 7:26 PM to 7:56 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.4 | 14.4 | 14.4 | 14.5 | 14.5 | 14.5 | 14.6 | 14.6 | 14.6 | 14.6 | 14.7 | 14.7 | 14.7 | 14.7 | 14.8 |
| Sunrise (AM) | 5:39 | 5:38 | 5:37 | 5:35 | 5:34 | 5:33 | 5:31 | 5:30 | 5:29 | 5:28 | 5:27 | 5:26 | 5:24 | 5:23 | 5:22 | 5:21 | 5:20 | 5:19 | 5:18 | 5:18 | 5:17 | 5:16 | 5:15 | 5:14 | 5:13 | 5:13 | 5:12 | 5:11 | 5:11 | 5:10 | 5:10 |
| Sunset (PM) | 7:26 | 7:27 | 7:28 | 7:29 | 7:30 | 7:31 | 7:32 | 7:33 | 7:35 | 7:36 | 7:37 | 7:38 | 7:39 | 7:40 | 7:41 | 7:42 | 7:43 | 7:44 | 7:45 | 7:46 | 7:47 | 7:48 | 7:49 | 7:50 | 7:51 | 7:52 | 7:52 | 7:53 | 7:54 | 7:55 | 7:56 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.8 | 5:39 | 7:26 |
| 2 | 13.8 | 5:38 | 7:27 |
| 3 | 13.9 | 5:37 | 7:28 |
| 4 | 13.9 | 5:35 | 7:29 |
| 5 | 13.9 | 5:34 | 7:30 |
| 6 | 14.0 | 5:33 | 7:31 |
| 7 | 14.0 | 5:31 | 7:32 |
| 8 | 14.1 | 5:30 | 7:33 |
| 9 | 14.1 | 5:29 | 7:35 |
| 10 | 14.1 | 5:28 | 7:36 |
| 11 | 14.2 | 5:27 | 7:37 |
| 12 | 14.2 | 5:26 | 7:38 |
| 13 | 14.2 | 5:24 | 7:39 |
| 14 | 14.3 | 5:23 | 7:40 |
| 15 | 14.3 | 5:22 | 7:41 |
| 16 | 14.3 | 5:21 | 7:42 |
| 17 | 14.4 | 5:20 | 7:43 |
| 18 | 14.4 | 5:19 | 7:44 |
| 19 | 14.4 | 5:18 | 7:45 |
| 20 | 14.5 | 5:18 | 7:46 |
| 21 | 14.5 | 5:17 | 7:47 |
| 22 | 14.5 | 5:16 | 7:48 |
| 23 | 14.6 | 5:15 | 7:49 |
| 24 | 14.6 | 5:14 | 7:50 |
| 25 | 14.6 | 5:13 | 7:51 |
| 26 | 14.6 | 5:13 | 7:52 |
| 27 | 14.7 | 5:12 | 7:52 |
| 28 | 14.7 | 5:11 | 7:53 |
| 29 | 14.7 | 5:11 | 7:54 |
| 30 | 14.7 | 5:10 | 7:55 |
| 31 | 14.8 | 5:10 | 7:56 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 6.5 kWh/m².
For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 7.29 kWh/m² in July across the year — May's 6.5 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.0 | 6.0 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.3 | 6.4 | 6.4 | 6.5 | 6.5 | 6.5 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.8 | 6.8 | 6.8 | 6.8 | 6.9 | 6.9 | 6.9 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.0 | Intense |
| 2 | 6.0 | Intense |
| 3 | 6.1 | Intense |
| 4 | 6.1 | Intense |
| 5 | 6.1 | Intense |
| 6 | 6.2 | Intense |
| 7 | 6.2 | Intense |
| 8 | 6.2 | Intense |
| 9 | 6.3 | Intense |
| 10 | 6.3 | Intense |
| 11 | 6.3 | Intense |
| 12 | 6.3 | Intense |
| 13 | 6.4 | Intense |
| 14 | 6.4 | Intense |
| 15 | 6.5 | Intense |
| 16 | 6.5 | Intense |
| 17 | 6.5 | Intense |
| 18 | 6.6 | Intense |
| 19 | 6.6 | Intense |
| 20 | 6.6 | Intense |
| 21 | 6.7 | Intense |
| 22 | 6.7 | Intense |
| 23 | 6.7 | Intense |
| 24 | 6.7 | Intense |
| 25 | 6.8 | Intense |
| 26 | 6.8 | Intense |
| 27 | 6.8 | Intense |
| 28 | 6.8 | Intense |
| 29 | 6.9 | Intense |
| 30 | 6.9 | Intense |
| 31 | 6.9 | Intense |
Hazard calendar for Viana do Castelo
In May, Viana do Castelo sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Viana do Castelo's rainy season runs October–May, when most of the year's rain falls.
Is May a good time to visit Viana do Castelo?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Viana do Castelo for sightseeing.
What to pack for Viana do Castelo in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Viana do Castelo sees daytime highs around 19°C and nights near 12°C. Pack sun protection. Worth having: rain gear. About 12 days see rain.
Sea temperature near Viana do Castelo in May
The nearest coast averages about 15°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 17°C and coldest in February near 13°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 14 | 13 | 14 | 14 | 15 | 17 | 17 | 17 | 17 | 17 | 16 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 13 | Bracing |
| Mar | 14 | Bracing |
| Apr | 14 | Bracing |
| May | 15 | Cool |
| Jun | 17 | Cool |
| Jul | 17 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 17 | Cool |
| Nov | 16 | Cool |
| Dec | 15 | Bracing |
UV index in Viana do Castelo in May
Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Viana do Castelo peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 9 | 9 | 8 | 6 | 4 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Where is Viana do Castelo?
Viana do Castelo sits at 41.7°N, 8.8°W, 12 m above sea level, in Portugal. The nearest listed city is Esposende, 18 km away.
Topography around Viana do Castelo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Viana do Castelo.
Within 3 km, the terrain around Viana do Castelo has significant variations in elevation — a maximum elevation change of 300 m around an average of 29 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 793 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,517 m.
The land around Viana do Castelo is covered by water (37%), trees (23%) and artificial surfaces (22%) within 3 km, water (47%) and trees (29%) within 16 km, and trees (38%), water (32%) and grassland (22%) within 80 km.
Portugal travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $32,082
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 95%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2022
- Road deaths
- 8.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 612
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Viana do Castelo (41.6932°, -8.8329°, elevation 12 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).